Originally Posted by KJ4567
Thank you. The good side???? It is windows instead of roof right?
Sorry, I don't understand what you mean by "the good side????" There is no good side in a bus.
I think the windows are 100X more likely as the source of leaks than the roof (excepting the roof escape hatches which are also prone to leaking). It's easy to seal the seams and rivets on the roof for good measure - took me like two afternoons to run beads of Dynatron-550 over them.
Removing the inner walls and ceiling panels makes identifying the sources of these leaks a lot easier, one of the reasons I tend to look askance at builds that have not done so (in addition to the lack of insulation problem).